X9421WSI_1182946

• Single Voltage Potentiometer
• 64 Resistor Taps
• SPI Serial Interface for write, read, and transfer operations of the potentiometer
• Wiper Resistance, 150 Typical at 5V
• 4 Non-Volatile Data Registers
• Non-Volatile Storage of Multiple Wiper Positions
• Power On Recall. Loads Saved Wiper Position on Power Up.
• Standby Current < 5A Max
• V_CC : 2.7V to 5.5V Operation
• 2.5K, 10K End to End Resistance
• 100 yr. Data Retention
• Endurance: 100, 000 Data Changes per Bit per Register
• 14-Lead TSSOP, 16-Lead SOIC
• Low Power CMOS

• Vary the gain of a voltage amplifier
• Provide programmable dc reference voltages for comparators and detectors
• Control the volume in audio circuits
• Trim out the offset voltage error in a voltage amplifier circuit
• Set the output voltage of a voltage regulator
• Trim the resistance in Wheatstone bridge circuits
• Control the gain, characteristic frequency and Q-factor in filter circuits
• Set the scale factor and zero point in sensor signal conditioning circuits
• Vary the frequency and duty cycle of timer ICs
• Vary the dc biasing of a pin diode attenuator in RF circuits
• Provide a control variable (I, V, or R) in feedback circuits
• Adjust the contrast in LCD displays
• Control the power level of LED transmitters in communication systems
• Set and regulate the DC biasing point in an RF power amplifier in wireless systems
• Control the gain in audio and home entertainment systems
• Provide the variable DC bias for tuners in RF wireless systems
• Set the operating points in temperature control systems
• Control the operating point for sensors in industrial systems
• Trim offset and gain errors in artificial intelligent systems

Temperature under bias . . . . . . . . . . . .  65 to +135
Storage temperature . . . . . . . . . . . . . . . 65 to +150
Voltage on SCK any address input
with respect to V_SS . . . . . . . . . . . . . . . . . . . .  1V to +7V
V = | (V_H V_L) | . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Lead temperature (soldering, 10 seconds) . . . . . . . 300
IW (10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6mA
Any V_H/R_H, V_L/R_L, V_W/R_W . . . . . . . . . . . . . . .  V_SS to V_CC

Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.

This is a stress rating only; functional operation of the device (at these or any other conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The X9421 integrates a single digitally controlled potentiometer (XDCP) on a monolithic CMOS integrated circuit.

The X9421 digital controlled potentiometer is implemented using 63 resistive elements in a series array. Between each element are tap points connected to the wiper terminal through switches. The position of the wiper on the array is controlled by the user through the SPI bus interface. The potentiometer has associated with it a volatile Wiper Counter Register (WCR) and a four nonvolatile Data Registers that can be directly written to and read by the user. The contents of the WCR controls the position of the wiper on the resistor array though the switches. Powerup recalls the contents of the default data register (DR0) to the WCR.

The X9421 XDCP can be used as a three-terminal potentiometer or as a two terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing.